verb (used without object), en·thused, en·thus·ing.
verb (used with object), en·thused, en·thus·ing.
Origin of enthuse
Examples from the Web for unenthused
Unenthused, he left in 2007 and applied for a job at Facebook.
I imagine John Adams would have had been unenthused if John Quincy had come home with a clip-on tie.
Republicans have reason to be unenthused—and to wonder whether Romney can recover.How Mitt Romney Can Win the First Debate With Obama|Robert Shrum|September 25, 2012|DAILY BEAST
1827, American English, back-formation from enthusiasm. Originally often humorous or with affected ignorance. Related: enthused; enthusing.